Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4591471970374a2…

MALICIOUS

PDF

75.9 KB Created: 2021-03-28 13:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f619a878e73915614aa147c7c4b3adbd SHA-1: c151a1aa13400dc10a1a54d46e74cdda4ab847e2 SHA-256: f4591471970374a226b710907dcebd7399f63704afcf77bc750b6e0611087438
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, with a critical ClamAV detection for Pdf.Phishing.Trojan. The primary malicious URL identified is https://crophysi.ru/123?utm_term=benyamin+biang+kerok+google+drive, which is likely used to redirect users to a phishing or malware download site. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/123?utm_term=benyamin+biang+kerok+google+drive In PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/guneg.pdfIn PDF document text
    • http://onlineeshop24.xyz/bapojubinegesia.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://help-verification.com/33805051131z6qrz.pdfIn PDF document text
    • http://pipvip.ru/mozilla_49.0_1_downloadkt5g4.pdfIn PDF document text
    • http://magic-spring.com/how_to_interpret_c13_nmr_spectrax639j.pdfIn PDF document text
    • https://milarenu.weebly.com/uploads/1/3/2/8/132814898/fogexubo-wipurojo-nubuxe.pdfIn PDF document text
    • http://myfoxing.online/toshiba_satellite_l755_price_in_pakistan2ctji.pdfIn PDF document text
    • https://kiwerulokakawe.weebly.com/uploads/1/3/4/5/134509827/2912891.pdfIn PDF document text
    • http://theharaka.online/certified_nurse_aide_renewal_form_texasah9iy.pdfIn PDF document text
    • http://velesvoyage.ru/learn_russian_podcast_redditkr93h.pdfIn PDF document text
    • http://nesobaka9.xyz/how_to_do_mla_works_cited_on_google_docs52vj9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0443cf80-32aa-4c69-8324-551ad7c95e2f/how_to_design_table_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/967fafeb-722d-4756-be9f-239eb0003b57/el_juego_del_angel_resumen_rincon_del_vago.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/how_to_win_on_show_champion.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/dugojaf.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_0c3e43911521472e9b0fd39da496edcd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/84230957502.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/7323244351.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/tafilowipag.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_4911dd31b5ae4767a1f5933cc427e3a2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 5088 bytes
SHA-256: 88471b51f13edcc567fba2f534739c946b226efc13e084e80c1480c00743d162
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 10584 bytes
SHA-256: 7d82bd41f3c55ae667b343fe149e82a0746e2cac7a194cb6901b2124db08e065
font_02_sfnt_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71